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Finding the Fourth Proportional to 423,626.40, 635,439.60 and 143,139.60

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Solution

The fourth proportional to 423,626.40, 635,439.60 and 143,139.60 is: 214,709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,626.40 : 635,439.60 = 143,139.60 : x
  2. Step 2: Convert to fraction form
    423,626.40/635,439.60 = 143,139.60/x
  3. Step 3: Cross multiply
    423,626.40x = 635,439.60 × 143,139.60
  4. Step 4: Simplify right side
    423,626.40x = 90,956,570,168.16
  5. Step 5: Solve for x
    x = 90,956,570,168.16/423,626.40
  6. Step 6: Final answer
    x = 214,709.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.